Caster



FIG. 1 is a top, front, right side perspective view of a caster showingour new design;

FIG. 2 is a top, front, left side perspective view thereof;

FIG. 3 is a top, rear, left side perspective view thereof;

FIG. 4 is a bottom, rear, left side perspective view thereof;

FIG. 5 is a front elevation view thereof;

FIG. 6 is a rear elevation view thereof;

FIG. 7 is a left side elevation view thereof, the right side elevationview being a mirror image of the left side elevation view;

FIG. 8 is an enlarged top plan view thereof; and,

FIG. 9 is an enlarged bottom plan view thereof.

The broken lines in the drawings illustrate portions of the caster thatform no part of the claimed design.

CLAIM The ornamental design for a caster, as shown and described.